//download.js v3.0, by dandavis; 2008-2014. [CCBY2] see http://danml.com/download.html for tests/usage
// v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime
// v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs
// v3 added dataURL and Blob Input, bind-toggle arity, and legacy dataURL fallback was improved with force-download mime and base64 support

// data can be a string, Blob, File, or dataURL




export function download(data, strFileName, strMimeType) {
    var self = window, // this script is only for browsers anyway...
        u = "application/octet-stream", // this default mime also triggers iframe downloads
        m = strMimeType || u,
        x = data,
        D = document,
        a = D.createElement("a"),
        z = function (a) {
            return String(a);
        },


        B = self.Blob || self.MozBlob || self.WebKitBlob || z,
        BB = self.MSBlobBuilder || self.WebKitBlobBuilder || self.BlobBuilder,
        fn = strFileName || "download",
        blob,
        b,
        ua,
        fr;

    //if(typeof B.bind === 'function' ){ B=B.bind(self); }

    if (String(this) === "true") { //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
        x = [x, m];
        m = x[0];
        x = x[1];
    }



    //go ahead and download dataURLs right away
    if (String(x).match(/^data\:[\w+\-]+\/[\w+\-]+[,;]/)) {
        return navigator.msSaveBlob ? // IE10 can't do a[download], only Blobs:
            navigator.msSaveBlob(d2b(x), fn) :
            saver(x); // everyone else can save dataURLs un-processed
    } //end if dataURL passed?

    try {

        blob = x instanceof B ?
            x :
            new B([x], {
                type: m
            });
    } catch (y) {
        if (BB) {
            b = new BB();
            b.append([x]);
            blob = b.getBlob(m); // the blob
        }

    }



    function d2b(u) {
        var p = u.split(/[:;,]/),
            t = p[1],
            dec = p[2] == "base64" ? atob : decodeURIComponent,
            bin = dec(p.pop()),
            mx = bin.length,
            i = 0,
            uia = new Uint8Array(mx);

        for (i; i < mx; ++i) uia[i] = bin.charCodeAt(i);

        return new B([uia], {
            type: t
        });
    }

    function saver(url, winMode) {


        if ('download' in a) { //html5 A[download] 			
            a.href = url;
            a.setAttribute("download", fn);
            a.innerHTML = "downloading...";
            D.body.appendChild(a);
            setTimeout(function () {
                a.click();
                D.body.removeChild(a);
                if (winMode === true) {
                    setTimeout(function () {
                        self.URL.revokeObjectURL(a.href);
                    }, 250);
                }
            }, 66);
            return true;
        }

        //do iframe dataURL download (old ch+FF):
        var f = D.createElement("iframe");
        D.body.appendChild(f);
        if (!winMode) { // force a mime that will download:
            url = "data:" + url.replace(/^data:([\w\/\-\+]+)/, u);
        }


        f.src = url;
        setTimeout(function () {
            D.body.removeChild(f);
        }, 333);

    } //end saver //download.js v3.0, by dandavis; 2008-2014. [CCBY2] see http://danml.com/download.html for tests/usage
    // v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime
    // v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs
    // v3 added dataURL and Blob Input, bind-toggle arity, and legacy dataURL fallback was improved with force-download mime and base64 support

    // data can be a string, Blob, File, or dataURL




    function download(data, strFileName, strMimeType) {

        var self = window, // this script is only for browsers anyway...
            u = "application/octet-stream", // this default mime also triggers iframe downloads
            m = strMimeType || u,
            x = data,
            D = document,
            a = D.createElement("a"),
            z = function (a) {
                return String(a);
            },


            B = self.Blob || self.MozBlob || self.WebKitBlob || z,
            BB = self.MSBlobBuilder || self.WebKitBlobBuilder || self.BlobBuilder,
            fn = strFileName || "download",
            blob,
            b,
            ua,
            fr;

        //if(typeof B.bind === 'function' ){ B=B.bind(self); }

        if (String(this) === "true") { //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
            x = [x, m];
            m = x[0];
            x = x[1];
        }



        //go ahead and download dataURLs right away
        if (String(x).match(/^data\:[\w+\-]+\/[\w+\-]+[,;]/)) {
            return navigator.msSaveBlob ? // IE10 can't do a[download], only Blobs:
                navigator.msSaveBlob(d2b(x), fn) :
                saver(x); // everyone else can save dataURLs un-processed
        } //end if dataURL passed?

        try {

            blob = x instanceof B ?
                x :
                new B([x], {
                    type: m
                });
        } catch (y) {
            if (BB) {
                b = new BB();
                b.append([x]);
                blob = b.getBlob(m); // the blob
            }

        }



        function d2b(u) {
            var p = u.split(/[:;,]/),
                t = p[1],
                dec = p[2] == "base64" ? atob : decodeURIComponent,
                bin = dec(p.pop()),
                mx = bin.length,
                i = 0,
                uia = new Uint8Array(mx);

            for (i; i < mx; ++i) uia[i] = bin.charCodeAt(i);

            return new B([uia], {
                type: t
            });
        }

        function saver(url, winMode) {


            if ('download' in a) { //html5 A[download] 			
                a.href = url;
                a.setAttribute("download", fn);
                a.innerHTML = "downloading...";
                D.body.appendChild(a);
                setTimeout(function () {
                    a.click();
                    D.body.removeChild(a);
                    if (winMode === true) {
                        setTimeout(function () {
                            self.URL.revokeObjectURL(a.href);
                        }, 250);
                    }
                }, 66);
                return true;
            }

            //do iframe dataURL download (old ch+FF):
            var f = D.createElement("iframe");
            D.body.appendChild(f);
            if (!winMode) { // force a mime that will download:
                url = "data:" + url.replace(/^data:([\w\/\-\+]+)/, u);
            }


            f.src = url;
            setTimeout(function () {
                D.body.removeChild(f);
            }, 333);

        } //end saver 


        if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
            return navigator.msSaveBlob(blob, fn);
        }

        if (self.URL) { // simple fast and modern way using Blob and URL:
            saver(self.URL.createObjectURL(blob), true);
        } else {
            // handle non-Blob()+non-URL browsers:
            if (typeof blob === "string" || blob.constructor === z) {
                try {
                    return saver("data:" + m + ";base64," + self.btoa(blob));
                } catch (y) {
                    return saver("data:" + m + "," + encodeURIComponent(blob));
                }
            }

            // Blob but not URL:
            fr = new FileReader();
            fr.onload = function (e) {
                saver(this.result);
            };
            fr.readAsDataURL(blob);
        }
        return true;
    } /* end download() */


    if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
        return navigator.msSaveBlob(blob, fn);
    }

    if (self.URL) { // simple fast and modern way using Blob and URL:
        saver(self.URL.createObjectURL(blob), true);
    } else {
        // handle non-Blob()+non-URL browsers:
        if (typeof blob === "string" || blob.constructor === z) {
            try {
                return saver("data:" + m + ";base64," + self.btoa(blob));
            } catch (y) {
                return saver("data:" + m + "," + encodeURIComponent(blob));
            }
        }

        // Blob but not URL:
        fr = new FileReader();
        fr.onload = function (e) {
            saver(this.result);
        };
        fr.readAsDataURL(blob);
    }
    return true;
} /* end download() */
